linux-kernel - Re: [GIT PULL 0/7] perf/core improvements and fixes

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Date:	Mon, 02 Jul 2012 12:01:32 +0400
From:	Dmitry Antipov <dmitry.antipov@...aro.org>
To:	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>
CC:	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Hitoshi Mitake <mitake@....info.waseda.ac.jp>,
	Jiri Olsa <jolsa@...hat.com>, linaro-dev@...ts.linaro.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mike Sartain <mikesart@...vesoftware.com>,
	Namhyung Kim <namhyung@...il.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"Pierre-Loup A. Griffais" <pgriffais@...dia.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tim Chen <tim.c.chen@...ux.intel.com>, arnaldo.melo@...il.com,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [GIT PULL 0/7] perf/core improvements and fixes

On 06/29/2012 05:12 PM, Ingo Molnar wrote:

> Pulled, thanks Arnaldo!

As of ca24a145573124732152daff105ba68cc9a2b545, 'perf sched replay' is still broken
(but 'perf report' works) if perf.data was recorded on another machine. For example,
native replay is:

run measurement overhead: 0 nsecs
sleep measurement overhead: 112071 nsecs
the run test took 1007080 nsecs
the sleep test took 1159668 nsecs
nr_run_events:        141
nr_sleep_events:      147
nr_wakeup_events:     73
target-less wakeups:  25
multi-target wakeups: 2
task      0 (           <unknown>:      4645), nr_events: 4
task      1 (                perf:      4646), nr_events: 190
task      2 (           swapper/1:         0), nr_events: 33
task      3 (         kworker/1:1:        20), nr_events: 126
task      4 (                sshd:      1881), nr_events: 32
task      5 (             kswapd0:       388), nr_events: 3
------------------------------------------------------------
#1  : 29.663, ravg: 29.66, cpu: 54.38 / 54.38
#2  : 28.442, ravg: 29.54, cpu: 53.38 / 54.28
#3  : 28.564, ravg: 29.44, cpu: 54.02 / 54.26
#4  : 28.290, ravg: 29.33, cpu: 53.50 / 54.18
#5  : 29.877, ravg: 29.38, cpu: 53.16 / 54.08
#6  : 32.227, ravg: 29.67, cpu: 53.74 / 54.04
#7  : 27.588, ravg: 29.46, cpu: 52.67 / 53.91
#8  : 30.762, ravg: 29.59, cpu: 53.44 / 53.86
#9  : 28.381, ravg: 29.47, cpu: 53.04 / 53.78
#10 : 28.473, ravg: 29.37, cpu: 53.71 / 53.77

"Cross-replaying" of the same perf.data is:

run measurement overhead: 65 nsecs
sleep measurement overhead: 55825 nsecs
the run test took 1000140 nsecs
the sleep test took 1064293 nsecs
nr_run_events:        0
nr_sleep_events:      0
nr_wakeup_events:     0
------------------------------------------------------------
#1  : 0.007, ravg: 0.01, cpu: 0.00 / 0.00
#2  : 0.001, ravg: 0.01, cpu: 0.00 / 0.00
#3  : 0.001, ravg: 0.01, cpu: 0.00 / 0.00
#4  : 0.001, ravg: 0.01, cpu: 0.00 / 0.00
#5  : 0.001, ravg: 0.01, cpu: 0.00 / 0.00
#6  : 0.001, ravg: 0.00, cpu: 0.00 / 0.00
#7  : 0.001, ravg: 0.00, cpu: 0.00 / 0.00
#8  : 0.001, ravg: 0.00, cpu: 0.00 / 0.00
#9  : 0.001, ravg: 0.00, cpu: 0.00 / 0.00
#10 : 0.001, ravg: 0.00, cpu: 0.00 / 0.00

Dmitry
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